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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="./css/01-demo.css">
    <title>Document</title>
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<body>
    <div id="demo">
        <span class="word">这是第一个dmeo</span>
    </div>
    <div class="second">
        <span>这是第二个demo</span>
    </div>
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